This is a picture I took looking directly west from the top of Red Mountain to the Pacific Ocean. I took it several years ago with a crappy camera but it is useful for illustrative purposes.
We inlanders feel so distant from the beach but we are really not. It is just that we have the mountains of Camp Pendleton between us. I think that the real "crow flies" distance is about fourteen and a half miles to the beach in Oceanside. It is even less than that through the base, about nine I think.